Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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A new free-living marine nematode species of the genus Pseudosteineria (Monhysterida: Xyalidae) from a subtidal zone of the East Sea, Korea

  • Hyo Jin Lee (East Sea Environment Research Center, Korea Institute of Ocean Science and Technology (KIOST)) ;
  • Heegab Lee (East Sea Environment Research Center, Korea Institute of Ocean Science and Technology (KIOST)) ;
  • Hyun Soo Rho (East Sea Environment Research Center, Korea Institute of Ocean Science and Technology (KIOST))
  • Received : 2021.11.18
  • Accepted : 2021.12.07
  • Published : 2021.12.31
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Abstract

A new free-living marine nematode species of the genus Pseudosteineria Wieser, 1956 affiliated with the family Xyalidae is described based on specimens collected from the sediment of a subtidal benthic environmental habitat in the East Sea, Korea. Pseudosteineria varisetis sp. nov differed from its congeners by the combination of the following characteristics: a relatively long body (1,628-1,691 ㎛ long in males), a circular amphideal fovea situated behind the subcephalic setae, the presence of lateral cuticular alae starting from behind the nerve ring, the presence of eight groups of long subcephalic setae, the presence of irregularly distributed variable lengths of somatic setae on the body, solid spicules (43.2-43.9 ㎛ long) with a cephalated proximal end, a long tubular shaped gubernaculum with dorsal swelling, and a conico-cylindrical tail with two to four terminal setae. In this report, we provide a taxonomic description and illustrations of a new species of the genus Pseudosteineria by differential interference contrast microscopy.

Keywords

Acknowledgement

This research was supported by a grant from the National Marine Biodiversity Institute of Korea (2021M01100) and by the research projects of the Korea Institute of Ocean Science & Technology(PE99913, PG52510).

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